66 



forcing air from the lungs with greater rapidity 

 through the trachea, or windpipe, in conse- 

 quence of the pain he feels from the stroke of 

 the whip, as m ell as from the bending of the 

 libs, in the action of turning round in a small 

 compass. 



This disease prevails in a different degree in 

 different subjects ; in its commencement it is 

 generally manifested by awhistlmg noise ; but 

 in its confirmed state, it is more sonorous, and 

 resembles deep groaning. In either state, it is 

 incurable, nor can there be any doubt of its 

 rendering a horse unsound. There are certain 

 circumstances, however, to be attended to, pre- 

 viously to deciding on the presence of the dis- 

 ease. A s\\'clling of the parotid glands, or that 

 part where the throat lash of the bridle passes 

 down, and M^hich frequently arises from a com- 

 plaint, called the strangles, will produce the 

 same sound as roaring, if the animal be obliged 

 to quicken his pace. Particular stages of a 

 cold will also have the same effect. It is, 

 therefore, necessary to ascertain that neither of 

 the above causes exists, before any conclusive 

 opinion can be formed with regard to a horse 

 being a roarer. 



The seat of the disease has hitherto remained 

 in considerable obscurity. By some it has been 

 ascribed to a partial obstruction in the nostrils, 

 or to a thickening in the membranes of the 



